Signal system and apparatus



H. M. FRiENDLY. SIGNAL SYSTEM AND APPARATUS.

APPLICATION FILED'NOV. 23, 1915.

Patented Nov. 16, 1920.

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SIGNAL SYSTEM AND APPARATUS.

APPLICATION FILED NOV. 23, 1915.

158585720. Patented NOV 16, 1920" 4 SHEETS-SHEET 2.

Wz/xyesses H. M. FRIENDLY.

SIGNAL SYSTEM AND APPARATUS.

APPLICATION FILED NOV. 23. 1915.

Patented Nov; 16, 1920.

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k H. M. FRIENDLY.

SIGNAL SYSTEM AND APPARATUS.

APPLICATION FILED NOV.Z3, 1915. V

Patented Nov. 16, 1920,

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HERBERT M. FRIENDLY, 0F PORTLAND, OREGON.

SIGNAL SYSTEM AND APPARATUS.'

Specification of Letters Patent. Patented NOV, 16, 1920.

Application filed November 23, 1915. %ria1 No. 63,028.

changes, and its objects are:

To enable telephone operators to ascertain if the station to be called is responsive.

to a call.

Further, an object ofthis invention Is to enable a private branch'exchange operator, located, for instance, in a hotel wherein connection is made to guests rooms, to be apprised, upon inserting a switching plug into a springjack to ringa guests room, that the said room is locked from-the outside, the inference being that the guest 1s without."

Further, an object of this invention is to enable attendants to remotely ascertain if a guests room door is locked from without.

Further, an object of this lnvention is to enable attendants to remotely ascertain the location of other attendants, who may be renovating guests rooms.

Further, an object of this invent1on 1s to enable attendants to remotely ascertain 1f the guests door key is in it's compartment in the door key case.

Further, an object of this invention 1sto allow signals to be extended from quarters "necessary to elucidate its principles, con-1 I of attendants toguests rooms where a housemaid may be renovating.

Further, an object of this invention is to enable switchboard operators, or other attendants, to be apprised, upon aguests door being unlocked from the outside.

Further, an object of this invention is to enable switchboard operators, or other attendants ,to be apprised, upon a guests door being looked from the outside.

-Ther eare many other applications and modifications belonging to and subordinate tothis'in-vention, which those skilled in the art to which it belongs will be able to adapt. In the accompanying drawings'and descriptions I have chosen such applications and organizations of my invention as I deem L scribers station.

eration, together with a subscribers station,

S1, on a line extending from said switchboard, and means, automatic and manual, whereby:the circuits at the subscribers station may be so altered asto evidence an understood condition to the operator at the switchboard, upon her making connection with, or making suitable manipulation of, the switchboard equipment associated with the said line extending to the said sub- Fig. 2 shows the essential parts of a common form of connecting cord circuit such as might be found on a private branch exchange switchboard suitable for use at a hotel, or for such similar service.

Fig. 3 shows the essential equipment on a switchboard as commonly used in common battery telephone operation in hotels, together with wires running to guests rooms where connection is made to a telephone and to a contact device in connection with the door bolt, an additional wire being run to the said contact wire from the switchboard springjack corresponding to the said telephone.

Fig. 4 shows a diagrammatic circuit of a plugadaptableto use to obtain access to the line running to the employees quarters shown in Fig; 3.

Fig. 5 shows a modification of the organization shown in Fig. 3, enabling a multiplicity of functions to be incorporated.

Fig. 6 shows diagrammatically a signal device. A signal device may be used to receive calls'intended for the servants quarters at a point remote therefrom.

Fig. 7 is a modification of the apparatus shown in Fig. 6. I r

Fig. 8 shows diagrammatically a plug Suitable for usein connection with the switchboard equipment shown in Figs. 3 and 5. Fig. 9- is a modification of the apparatus shownin Figs. 6 and 7.

Fig.. 10 is a partial assembly vlew of the apparatus shown diagrammatically in Figs. 6, 7 and 9,'a1so comprising a display sign.

Fig. 11 shows a part of the system as sociated with Fig. 5 'oined on toth'e lower portion of the latter. gure. The apparatus shown is to enable an attendant to ascertain if a 'gu'ests room door is locked from the outside; and also to ascertain iffthe guests door keyis in its compartment in the door key case.

ig. 12 shows a part of the system associated with Fig. 5 joined on to the lower portion of the latter figure. The appa ratus shown is to enable an attendant to remotely ascertain when a guests door may become unlocked.

Fig. 13 shows a part of-the system associated with Fig. 5 joined on to a lower po r-. tion of the latter figure. shown is to enable an attendant to remotely ascertain the location of attendants .that may be renovating rooms. I 1

Fig. 14 shows a partof the'systein associated with Fig. 5 joined onto thelower portion of the latter figure. The apparatus shown is to enable an attendant to remotely I from the outside and also to ascertain when ascertain if a guests room door is locked a guests room may become unlocked from the outside.

- Referring to the figures in detail: 5

InFig. 1,'J1 represents a springjack as connnonly used on switchboards; R1 is a re- 'lay commonly known as a line relay asso ciated therewith; 6 is the companion lampto J1 in] a local circuit relay R1. Completing a circuit between the springs; 1 and 4, or between the line conductors 20: and 21 leading therefrom, will cause relay to become energized by virtue of its deriving current from battery B1 through itsfhelix, through contacts-?-t and 1-2, to ground G3.- This will cause said lamp 6 to glow, it thus acting as a' calling signal. It will be observed that the closing of the limbs 20 and.

21 of the line through the substation set S1 at contact between hook 21 and spring 22, asby removing the receiver 24, will cause a similar function. a

Springs 10 and 11 are'parts of a contact device and are adapted. to be closed by a door bolt, 15, engaging insulated member 12', which is attached to spring 11. The said doorbolt may be actuated as commonly by the application of a ,lock key applied in the keyhole 16, or it may be a common door bolt or a moving member otherwise operated. in the drawing a sorcalled double lockin common use is shown, the bolt actuating the The apparatus when plu contact members 10 and 11, being adapted to be operated from one side of the door only, while a.second bolt, 13, is adapted to be-actuated independently as by applying a lock key in keyhole 14: from the opposite side ofthe'doon' However, this second bolt is not'essential and. but one-bolt actuated from either or both sides of the door is all that'is required tocarry out this phase of the guest upon locking his door from the outside will cause contacts 10711 to be ZO-connected to the jackspringl to become grounded through the gravity hook 21, and its engaging spring 23. A similar grounding action would ensue -if. switch l9 were closed. The latter switch may be closed by designed mechanical movement or automatically- Ifeither contact 1011 or the switch 19'are closedand'hook switch of substation set S1 is in normal position and a plug, as P1, F i 2, is appliedinto springjack J1, relay '2 will-become energized, opening contact 28-29 thus precluding the glowing of lamp 30.- he lamp 30can' only glow P1 is inserted into springjack J1 under t e conditions that relay R2 would not be energized, as would be the case if contacts10-11 were open and switch 19 was open. 'lJpon the insertion of said plug P1 into said springjack J1, the nonglowing of lamp 30 will indicate to the operator that either the guests room, door islocked from .the outside (provided that the contact device is adapted to be actuated by the outside belt) or that the switch 19 has been closed. In either event the operator would'understand further that the guest was notav'ail able, or did not wish to be called.

While the description above has been specific as regards a guests room in a hotel, it is manifest that this may with equal facility be adapted to general exchange operation --w herein the substation "and the contact device or'switch are many feet or many miles remote from the switchboard.v The contacts 10 11, while shown actuated by a door. bolt,

the opening of a desk or the closing of a desk would cause thecontacts 1011 to be closed, whereupon the insertion, of a plug 'closed, thereby causing'the line conductorinto the associated springjack J 1 would give a predesigned indication to the operator locatedremotely. The conductor leading from spring 10 and from switch 19'leads to a spring 23', making contact with a hook device 21 of the substation S1 in the normal Theeswitch 19 may be located at any convenient point, as for instance on the top of a telephone where its position would be readily observed. Such a switch might be used in case a subscriber was leaving his place of business and would desire to have the operator at the central office know-that he was not available and could thus so report to calling parties or could transfer his call to another telephone, understood by proarrangement.

In Fig. 3,J 2 and J3 respectively represent springjflcks in a switchboard such as are commonly used at private branch exchanges, however, with auxiliary contacts 52 and 53 and 60 and 61 respectively. Relay R4, switch 70, buzzer 71 and battery B3 com prise the usual so-called night alarm circuit equipment common to all line signals as employed in usual practice. V sent springs of acontact device adapted to be actuated by lockbolt 77. Similarly 80 and 81 represent springs of a contact device adapted to be actuated by lockbolt 82.

S3 represents a usual type of substation telephone set as may be located 'in the maids quarters of a hotel. The contact device, springs of which are designated 80 and 81, is so disposed in the doorjamb of said room that when the lockbolt 82 is actuated, as by locking the door with a key or other equivalent means, the said springs are flexed into electrical contact. It is a very common practice in hotels and such establishmentsto'use double locks, one bolt of the lock being actuated by applying a key at the outside of the door and the other bolt being actuated by the key being applied from the inside of the door, the preferred arrangement being that the bolt 82 and also the bolt 77 referred located on the outside door casing of the said guests room. In addition tobeing provided with the usualtipand sleeve springs 74 and 75 respectively this springjack has auxiliary contacts 72 and 73.

Ordinarily, on each floor, there would be one set, as S3, together with its associated contact device represented by springs 80 andv 81. There would be as many sets as S2, with its associated contact door bolt device, as are represented by springs 78 and 79 and the associated, springj ack J '4, as there are guests rooms or other equivalent rooms on each By referring to Fig ,2 it will be observed that, ota plug, as 1, is inserted into a springjack J 3, the switchboard operator can 78. and 79 repre and 6l -65 are opened; also springs 60-61 will be flexed into contact. Should the contact 80 8l be open, due to the doorbolt 82 being in normal position, the usual circuit conditions will prevail. If, however, contact 80-81 should be closed, asby the bolt 82 being in the locked position as if the room were unoccupied and locked from without, current would flow from grounded battery B3, through lamp 59, contact springs 6061, over conductor 87, through contact 8081 to ground G12, causing said lamp 59 to glow, indicating .to the operator that the door of the room in which substation S3 is located, is locked from without and is therefore unoccupied. It would thus be unnecessary.to signal. If, however, said plug P1 were inserted in jack J2 to ring guests substation set S2 and-the room containing said set were locked from the outside, indicating that it was unoccupied, lamp 51 would glow by deriving currentin a similar manner to the p'revious case by way of contacts 5253, conductor 84, contacts 7 978, to ground G11.

In order to reach the attendant, who may be absent from the room containing substation set S3, and who may be renovating a ,guests room, such as the one containing suband a signal device, thus, at thetime the maid enters said guests room, she may insert the plug Pet into springjack J 1. This will place the sounding device 161 into multiple relation with the sounding device 91 of substation set S3; The insertion of. said plug P4 into jack J4 will also cause the springs 72 and 73 to be flexed into electrical contact, supplementing or performing the same circuit conditions as the flexing of springs 78 and 79. The object of this latter function will be shown later. It will be noted that, if the operator proceeds to ring substation set S3, the attendant will receive the signal as extended to device shown in Fig. 10. The attendant can then respond by using the telephone in the room being renovated, containing substation set S2. It

will be observed that, since contacts 7273 are in electrical continuity and contacts 7 8-7 9 are open, due to the fact that theattendant has unlocked the guests room door,

be a multiplicity on each floor.

to the operator that the guests room door must be locked from the outside and that the guest is therefore'without. However, since the lamp 51 first glowed, as a calling signal, she knows that such cannot bethe case and infers that the call must be the at tendants response to the call initially transin'itted to station S3.

A further object in the multiple relation between springs 78 and 79 and 72 and 73 is that, should the operator desire to signal a v guests room while same is being renovated,

. the contact 78.79 being incidentally opened during that period, under her insertion of' the switching plug into jack J2, the operator will observe the glowing of lamp 51, thus indicating to her that the guest is without. Where desired the attendant maybe given a set as shown in Fig. 4, consisting of a plug P3, a transmitter 25, and a receiver R. She may respond to the callsent to substation set S3, by withdrawing the plug shown in Fig. 10 and inserting the plug P3 .shown in Fig. 4. The object of the combined sign and signal is that supervising attendants, or others iterested, may easily find the room that the attendant may be renovating, in case the attendant may he wanted in person.

Fig. 5, in conjunction with Figs. 11, 12, 13 and 14, shows a modified organization of my invention, as applied to such establishments as hotels wherein jack J4 represents the switchboard termination of a guestls, or other equivalent, room, of which there may J5 and J6 indicate the switchboard terminations of two attendants room substation sets, which may be on one floor. I If it is desired to signal-the guests room substation set S4 to gain the response of the occupant, plug, as P1, would be inserted into springjack J4. This will incidentally close contact springs 105-106. If contact springs 147-.148 are in electrical continuity as by the guests room door 17 being locked from without, for instance, lamp 101 will glow by virtue of deriving current from battery B4, through contacts 105'106, over conductor 165, to ground G13. In case the operator has attempted to call the guest over his said telephone andupon inserting the said switching plug P1 obtained the glowing of the said lamp 101, indicating that he was without, the operator may then withdraw the pushbutton 104,.thus

allowing the contact springs 102 and 103 to upon glow by virtue of obtaining current rover conductor 173 to ground G15.

guest of any message that may be left for him.

Should the operator desire to ascertain if the room, containin substation S6, is 00- cupied' by' the atten ant she may desire to summon, or-otherwise, she may do so by in sorting plug, as P1, into springjack J6. If the room door is. locked from without the contact springs 162 and 163 will be in electrical continuity and the lamp 123 will therefrom battery B4 through contact 128129 If 7 however, the operator so desires, she may depress .pushbutton 127 inlieu of inserting the said plug P1 as above described. This will perform the same circuit relation as regards lamp .123, conductor 173 and contact spring 163. The use of 'pushbutton 126, also the use of pushbutton 115, would be the same as above described for pushbutton 104.

Springjack, as per J7, is associated with and is a part of the telephone equipment of each guests room and is preferably installed on the outside doorcasing of a corresponding room and performs a similar function to that described in connection with Fig. 3. However, it has the additional function of permitting special signal devices to be used for selective calling. For instance, the attendant, having headquarters at the room containing substation set S6, would carry a signal device plug wired as per Fig. 6, while the' attendant having headuarters at the room in which substation set 5 is installed, would, have a signal device wired, as per Fig.7, or they may use a signal device wired as per Fig. 9, thus should ordinary alternating current signaling be attempted over jack J5, any plug, as per Fig. 7 or .Fig. 9 inserted in jack J7, would be responsive; similarly such signaling current applied to jack J6 would actuate a signal device wired as per Fig. 6 or Fig. 9. Bearing in mind that a jack, as per'J7, is installed associated with each guests room, and that all the springs corresponding to 138 and139 respectively are' in multiple relation as regards each floor, for instance, and that certain attendants having head uarters at the room containing substation 5 or substation S6, as the case maybe, will be provided with plugs, as per Fig. 6, certain attendants with plugs, as per Fig. 7, and 120 certain attendants with plugs, as per Fig. 9,

close. .Then' upon the guest unlocking his ,it will be seen that, upon the operator sig room door to enter, the contact springs 146 and 147 will become reflexed into electrical continuity, thereby completing a circuit from battery B4, through said lamp, over conductor 164, to ground G13. This will cause the said lamp 101 to glow and attract the attention of the operator, who will proceed to respond to the signal. and inform the .clerks desk, so that he may ascertain if a naling on either jack J5 or J6, will extend her signal to the corresponding attendants, who may be renovating a guests room and be provided with the prearranged signal device as above mentioned.

It is convenient 'to have means at the guests room dooris locked from without,

without calling the room over the telephone door 17 is locked from without, the closing.

of contacts 202203 will cause lamp 201 to derive current from battery B5, over con ductor 250, conductor 165, to ground G13, by way of contacts 148-147. Relay R5, buzzer 211 and switch 212 comprise an alarm circuit common to all similar pushbuttons that may be on the clerks desk.

Coincident with the closing of contact 202-203, contact 305-206 will become closed. Guests room door key 218 is in key compartment in the oiiice or other-point. 210 and 221 are metallic plates that serve to allow an electrical connection to be made from spring 205, through the door key, to ground G16. Relay R6, buzzer 216 and switch 217 comprise equipmentsin an alarm circuit associated with lamp' 207.

Should the clerk depress push button 204, as above mentioned, and the guests room referred to is locked from without, the guests key being in its place in the key case, lamps 201 and 207 will glow, indicating to the clerk the positive condition. The said lamps 201 and 207 maybe common to all pushkeys in the installation, all corresponding springs 202 and 206 being connected in multiple relation. Pushkey 204 is a locking key and may, therefore, be depressed and mechanically held thus. Then if the controlling switches 212 and 217 of the pilot circuits are closed, their respective buzzers will sound upon current being derived through their respective relays.

The circuit and equipment shown in Fig. 12 is for the purpose of enabling the clerk to not only ascertain if the room door is unlocked from the outside, indicating that the guest is probably within, but it is to enable him in the event that he finds the guest has his door locked from without to depress button 255 to its locked position. Upon the guest unlocking his door current from battery B6 will be derived through relay R7, through lamp. 227, causing it to glow, through contacts 226-225, over conductor '249, through contacts 146-147, to ground G13. Provided switch 232 is closed, the clerk'will be apprised by the sounding of the buzzer 231 immediately upon the guest unlocking his door from without. But one lamp, as 227, would be used common toany number of buttons, asper 255. All corresponding springs 226 may ,be connected in multiple relation to enable the lamp 227 to beused as a common lamp.

Fig. 13 shows only three lamps of as many lamps as there may be guests rooms on any floor, for instance, controlled by switch 255.

-. Said lamps and switch may be located at the housekeepers quarters, or convenient to the switchboard operator. By closing said switch, lamps will glow corresponding to every guests room into the decreasing springjack, as J7, of which may be inserted. a plug, the battery B7 obtaining ground through the corres ending lamp and the contacts correspon ing. to 135136, to ground G13. It will be observed that when a plug, as P4, Fig. 6, is inserted into springjack, as J7, the spring 137 registers with thetip conductor of the plug. Also springs 135, 136 and 137- are flexed into electrical contact with each other.

F 1g. 14 represents one of as'many keys,

the cam of which is designated 243, as there may be guests rooms. sociated lam cuit comprisin relay R8, buzzer 248 and controlling swltch 247. Key cam 243 has three positions-the normal position shown, position 241, which incidentally closes contact 236237, and position 242, which incidentally closes contact 238--239. The equip ment shown in said Fig. 14 may be located at the floor attendants quarters or other suitable place, and it is to enable said attendant It has with it an asto remotely ascertain the locked or unlocked state of the guests room door as regards the outside lockbolt. If the door is unlocked, meaning that contact 146147 is closed, current from battery B8- will fiow through relay R8, lamp 240, contact 238-239, over 240 and a common pilot cir-' conductor 252,' to ground G13, by way of said contact 146-147, glowing the said lamp 240, and thus indicating to the attendant manipulating the said key cam 243 that the guests roomdoor is unlocked with relation to the outside doorbolt, the conclusion being that the guest must still be in his room. If it is desired to know when the guest has left his room and in the usual order locks his door from the outside, key cam 243 will be moved to the position 241 and allowed to lock in that position, thus permanently closing the door from the outside, incidentally closing contacts 147148, current from battery B8 will flow through relay R8, through lamp 240, through contact 237-236, over conductor 251, through contact 148 -147, to ground G13, glowing lamp 240, and incidentally energizing relay R8, closing contacts 244246 and causing buzzer 248 to sound, switch 247 being assumed closed.

Having thus described these specific aning contacts 236237. Upon the guest lockvice controllable by a switch adapted to ing set adapted to register with said springjack, said switching set having indicating elements so related to said plug that a closed or open-circuit condition through said s'ub-' station set may be determined; a contact declose a ground connection with one only of said conductors so the said indicating elements will respond as if the path through said substation set were closed.

2. In a signal system the combination ofa springjack with conductors leading there- I I from to a substation set; a plug of aswitching set adapted to register withsaid spring jack, said switching set having indicating elements so related to said plug that a closed 1 or open-circuit vcondition through said substation set may bedetermined; a contact device controllable by a switch operated by adoor-bolt adaptedto close a circuit pathto one only of said conductors so the said indicating elements will respond as ifthe path through said substation set were closed.

3.'A spring-jack on a telephone switchboard With conductors leading therefrom to a substation set; contact points which normally'make connection from said conductors through said springj ack to signal equipconductors. becoming closedthrongh said substation set; a third conductor closable to I a common conductor to said signal device through the agency of a circuit-closing de- 40 vice in said springjack adapted to close said ment adapted to actuate upon path of said vice at a remote point and a contact deconductor to the free terminal of said signal equipment upon a switching plug registerin'g with said springjack.

4. A- springja-ck with conductors leading therefrom to a substation set; contact points which normally'make connection from said conductors through said springjack to signal device equipment adapted to actuate upon path of said conductors becoming closed through said substation set, saidcontact points opening connection upon a switching plug registering with said springjack; a third conductor closable throng said'signal equipment to va common terminal of said signal equipment through the agency of a. circuit-closing device at a remote point and an auxiliary contact'devi-ce in said springjack adapted to close said conductor to the free terminal of said signal ingwith said'springjacki. I

v5. The combination of a telephone line equipment upon a switching plug: registerleading from a spring] ack on a switchboard;

a substation set on said line; an independent conductor, a contact device companion to said springjack adapted to connect said independent conductor to a terminal of a signal equipment normally connected to said line and which will actuate upon line-circuit closing; contacts in said springjack adapted to disassociate said-signal equipment from said line upon a switching plug registering with said springjack; a second conductor common to said contact device and said signal equipment, a contact device adapted to complete a circuit over said conductor and over said second conductor common to said contact device and said signal equipment to actuate said line-signal equipment and means independent of the substation'for operating saidcontact device. V

6'. The combination of a line springjack having two line springs normally in contact respectively with two; anvils, one of which anvils is electrically connected to ground and the other of which anvils is electrically connected to the free terminal of a signal equipment whose: other'terminal is connected to a grounded current source, the. said anvils designedtodisengage said line springs upon the registry of a' switching plug with said springjack; a first and a second conductor leading from said line springs respectively and extending to a substation set; a third conductor leading to a first ter-' minal of a contact-making device controlled by the bolt of the door to the-room containing said substation set, and extending to ground; a fourth conductor leading from the companion terminal of said first terminal of said contact making device to a first of a set of two auxiliary contacts on said springjack, said contacts being normally disengaged with respect to each other but adapted to engage uponregistry of a switching plug with said sprin'gjack; the second of said auxiliary contacts electrically connected with the free terminal of said signalequipment. I c

7. The combination of a line springjack and an associated calling signal device having one terminal connected to-"a common current; source terminal; said springjack'. having a set of auxiliary contacts adapted to be closed incidental to the normal insertion of a switching cord plug into said "springjack; "a first conductor from one auxiliary contact of said set leading to the free terminalof said signal device, a second conductor from the other auxiliary contact of said contact set extending to a contact-making deviceoperative from a door-bolt which said contact device is adapted to .efi'ect a connection from said second conductor to ound upon the door-[bolt being. turned to v oclred position; a second springjack mountable companion to said door-boltand having a set of contacts in multiple relation with contacts of said contact-making device, the

having conductors leading from its tip and sleeve springs to a substation set in a guests room; an auxiliary conductorleading from an auxiliary spring of said springjack extending to a contact device operated by the door.- bolt of said guests room, the locking of'said guests room closing a circuit from said auxiliary conductor to a common terminal of a signal device the free terminal of which extends to a contact of said springjack companion to said auxiliary spring, which springs are adapted to engage upon a switching plug registering with said springjack on said switchboard similarly related to an attendants room substation set and contact device controlled by door-bolt of said latter room; as many springjacks corres )ondin to 'uests rooms as there ma be guests rooms in a group, all of the tip and sleeve springs respectively of the latter springjacks being in multiple relation with each other and with the tip and sleeve conductors respectively leading to saidattendants room and said second springjack; a plug comprising a signal device, said plug adapted to register with said latter springjacks.

9. The combination of a springjack 011 a switchboard with conductors leading from the tip and sleeve" springs thereof to a substation set in a guests room; anvils of said springjack normally registeringwith said tip and sleeve springs; a third conductor leading from one of said anvils extending to a common terminal of a signal device, a conductor leading from the other said anvil extending to the-free terminal of said signal device; a set of auxiliary cont-act springs on said springjack one spring of which has a conductor leading to the said free terminal of said signal device and the companion spring of which has a fourth conductor a which leads to the make spring of a set of three contacts in a contact device operative from the door-bolt of the said guests room, the pivot spring of which is connected to said common terminal, the break contact normally registering leading to one of an auxiliary set of normally open switch contacts companion to said springjack, the mate contact of which is electrically connected to the said free terminal of said signal device; a switching plug adapted to register with said springjack and'incidentally close said auxiliary contacts, the latter to the purpose of completing circuit to said signal device when doorbolt is in locked position; a

means of effecting contact between elements of said auxiliary switch contacts for the purpose of completing circuit to said signal device when said door-bolt is in normal posltion.

10. The combination of a springjack on a switchboard with conductors leading from the tip and sleeve springs thereof to a substation set in a guests room; anvils of said springjack normally registering with said tip and sleeve springs; a third conductor leading from'one of said anvils extending to a common terminal of a signal device, a conductor leading frointhe other said anvil extending to the free terminal ofsaid signal device; a set of auxiliary cont-act springs on said springjack one spring of which has a conductor leading to the said free terminal of the said signal device and the companion spring of which has a fourth conductor which leads to the make spring of a set of three contacts in a contact device operative from. the door-bolt of the said guests room, the pivot spring of which is connected to said common terminal, the break contact normally registering leading to one of an auxiliary set of normally open switch contacts companion to said springjack, the I mate contact of which is electrically connected to the said free terminal of said'signal device; a switching plug adapted to register with said springjack and incidentally close said auxiliary contacts, the latter for the purpose of completing circuit to said signal device when door-bolt is in a locked position; a means of effecting contact between elements of a said auxiliary switch contacts for the purpose of completing circuit to said signal device when said door-bolt is in normal position; a second springjack with auxiliary contacts associated with the contacts of the device operated by said door-bolt and located contiguous to the said guests room so related electrically that upon inserting a plug into said second springjack contacts therein will close forming the same circuit relations respecting the said third conductor as if the said door-bolt were in a locked position.

11. A line springjack having conductors extending from its two engaging springs to a substation set in a guests room; a third conductor extending from an auxiliary spring of said springjack to a contact of a circuit-closing device adapted to be operated by the door-bolt of said guests room; a second springjack similarly related to an attendants room substation set and a contactclosing device controlled by the doorbolt of said attenda'nts room; springjacks corresponding to guests rooms and contiguous a signal device adapted to electrically regw springjack leading to a telephone set in ister with the engaging springs of the said contiguous springjack; a set of auxiliary contacts adapted to be placed into electrical connection between said third conductor and a terminal common, to a signal device at said first springjack and the free terminal of said contact-closing device upon the registry of said plug with a said contiguous springjack.

12. In a signal system adaptable to hotel guests rooms and equivalent uses, a first contact device operative by the door-bolt of a guests room; a source of current, a

said guests room; a first conductor leading from said first contact device to a second contact device adapted to operate upon the insertion 'of a switching plug into said springjack, the first said contact device completing an electrical connection between said first conductor and a common conductor and the said second contact device completing operative electrical connection between said first conductor and a signal device one terminal of which is in electrical connection through said source ofcurrent'to said common conductor.

13.- In a signal system adaptable to hotel guests rooms and equivalent uses, a first contact device operative by the door-bolt of a guests room; a springjackleading to s room; conduca telephoneset in said guest tors leading from said first contact device to a second contact device adapted to operate upon the insertion of a switching plug into said springjack, the first said contact device completing electrical connection be tween said conductors and the said second contact device completing a connection through a signal device, an'da source of current. v

14:. A hotel signal system central office switchboard having springjacks, telephone lines leading, from the comprising a springjacks to telephones in the guests rooms, signal devices adapted to register wlth springjacks contiguousto and corresponding tothe guests" rooms, a signal de-v vice at the switchboard for each line, and means whereby theconnection of the first of said signal devices with the corresponding springjacks will actuate a signal device corresponding to the line and central office springjacl.

15. In a signal system a springjack connected by talking conductors with a substation set, a signal device, a set of auxiliary contacts on said springjack for closing thefree terminal of said signal device to a common conductor leading to the substation set,

the other terminal of said signal device station set; a set of auxiliary contacts on said springjack for closing the free terminal of said slgnal device to a common conductor connecting the signal device and substation,

the other terminal of said, signal device being connected to one pole of a common current source; a switch device operated by a door-bolt which is adapted to close said common conductor to the oppos te pole of said common current source. Signed by me at Portland, county of Multnomah, and state of Oregon, in the presence of two witnesses, this 9th day of November, 1915.

HERBERTM. FRIENDLY.

Witnesses: i

A. E. BURNS, Soo'rr BOZORTH. 

